Hi! This is my first time posting on Reddit, and I really hope someone can help me out.

I drive a 2014 Lexus IS250. Yesterday, I couldn't unlock the car at all. It was locked with double security from the key, so I had to call a professional locksmith to open it. Turns out the car battery had completely died.

I bought and installed a brand new car battery, but the key still doesn't work. I think the double-lock security might still be active? I can't lock or unlock the car—neither remotely nor manually.

The engine starts, but now the dashboard is flashing all kinds of error messages that weren’t there before. On top of that, although the dashboard has power, nothing else seems to work: the windows, seats, multimedia, and even the steering wheel are all unresponsive.

I also replaced the key fob battery (even though it was working fine before) just to be sure—no change.

Right now, I’ve left the car unlocked from the outside because if I manually lock it from the inside, I’ll need the locksmith again to get back in.

Has anyone experienced this or knows what might be going on? I’m stuck and would really appreciate any help.